摘要
选择四川雅安地区某简易锌浸出渣堆场作为研究对象,通过描述性统计分析、污染特征对比、多元统计分析和污染物空间分布表征等方法,对堆场土壤重金属污染特征进行识别分析。结果表明:堆场土壤中Zn、Pb、Cd和As含量明显高于对照点和风险筛选值,平均值分别达到对照点的27.33、25.22、24.24和22.11倍;堆场土壤中Zn、Cd和Mn具有较高的可迁移性,而As、Sb和Pb等重金属迁移性则相对较差,浸出液中Zn、Cd浓度普遍达到危险废物水平;场地土壤中As、Cd、Pb、Zn、Cu、Hg和Sb之间均存在显著(P<0.05)或极显著(P<0.01)的相关性,Mn与Cd、Zn之间存在极显著(P<0.01)的相关性,Ni、V、Cr和Co则与其他重金属间相关程度相对较小;堆场重金属污染物主要随水迁移扩散,并在渣库内低洼处聚集;随深度增加,堆场土壤pH呈递增趋势,Zn、Cd、Pb、As、Hg、Cu和Sb含量总体呈递减趋势,重金属污染物主要积累在场地表层1~2 m的人工填土层中。
A simple zinc leaching residue yard in Ya'an,Sichuan province was selected as a research object.The soil samples were analyzed by descriptive statistical analysis,pollution characteristics comparison,multivariate statistical analysis and spatial distribution of pollutants,to identify and analyze the heavy metal pollution characteristics of the residue yard.The results showed that the contents of Zn,Pb,Cd and As in the soil were significantly higher than the reference sample and risk screening values,and the average values reached 27.33,25.22,24.24 and 22.11 times of the reference sample respectively.Zn,Cd,Mn in the soil had a higher mobility,while the mobility of As,Sb and Pb was relatively poor.And the contents of Zn and Cd in the leachate generally reached the level of hazardous waste.Correlations among As,Cd,Pb,Zn,Cu,Hg and Sb were significant(P<0.05)or very significant(P<0.01).A very significant(P<0.01)correlation existed among Mn,Cd and Zn,and correlations among Ni,V,Cr,Co and other heavy metals were relatively small.Heavy metals in the residue yard were mainly migrated and diffused with water,and accumulated in low-lying areas of the yard.With the increase in depth,the soil pH of the residue yard increased,the contents of Zn,Cd,Pb,As,Hg Cu,Sb and Cu were generally decreased,and heavy metals were mainly accumulated in the artificial fill layer,1~2 m below the ground.
作者
刘恒博
姚勤英
郑钦文
雍毅
杨金燕
吴怡
侯江
LIU Hengbo;YAO Qinying;ZHENG Qinwen;YONG Yi;YANG Jinyan;WU Yi;HOU Jiang(Sichuan Academy of Environmental Sciences,Chengdu 610041,China;College of Architecture and Environment,Sichuan University,Chengdu 610227,China;Sichuan Ecological Environment Monitoring Station,Chengdu 610031,China)
出处
《环境保护科学》
CAS
2022年第4期133-140,共8页
Environmental Protection Science
基金
科研院所基本科研业务费项目(2021JDKY0022)
四川省重点研发项目(2021YFS0287)。
关键词
锌浸出渣
土壤
场地调查
重金属
污染特征
zinc leaching residue
soil
site investigation
heavy metals
pollution characteristics
